these 3 derivations will be built:
  /nix/store/gj2n95sw9c1p786d8cnba5bbwd93j3ln-treefmt.toml.drv
  /nix/store/wchw7cfjq44f7sjvsxh1i0wxmfbnyvrd-treefmt.drv
  /nix/store/306b0hqpvbh1wspzimfpsa2b0ykc307j-treefmt-check.drv
this path will be fetched (964.9 KiB download, 2.3 MiB unpacked):
  /nix/store/q3wdvmgvnahnxr5gp1z3qpqkci2z19zm-nixfmt-rs-0.4.1